Photosynthesis and respiration are essential processes in the ecosystem, and they involve the recycling of several key substances. The four main substances that are recycled during these processes are:
- Carbon Dioxide (CO2): During photosynthesis, plants absorb carbon dioxide from the atmosphere, which is then used to produce glucose. In respiration, organisms release carbon dioxide back into the atmosphere after breaking down glucose for energy.
- Oxygen (O2): Photosynthesis produces oxygen as a byproduct, which is released into the atmosphere and used by organisms during respiration. In turn, respiration consumes oxygen to help convert glucose into energy.
- Glucose (C6H12O6): In photosynthesis, plants synthesize glucose, which serves as an energy source. During respiration, this glucose is broken down to release energy, and the cycle continues as glucose is replenished through photosynthesis.
- Water (H2O): Photosynthesis requires water, which is used in the light-dependent reactions to produce oxygen and energy carriers. In respiration, water is produced as a byproduct when glucose is metabolized for energy.
These substances form a crucial part of the carbon and water cycles, ensuring that life-sustaining processes continue in nature.